Troubleshooting W-CDMA Measurements
This section lists common problems that you may encounter when making
W-CDMA measurements, plus the cause of and fix for each problem.
Problem/Cause Solution
Unable to demodulate W-CDMA Signal
ü For [
trial 1998 forward link], Perch 1 signal
not present or signal level too low.
Verify that signal includes Perch 1 and that the Perch
signal level is adequate.
ü For [
ARIB rev 1.0-1.2], Perch signal with
first search code not present or signal level
too low.
Verify that signal includes Perch with the first search
code and that the signal level of each is adequate.
ü For [
3GPP 1999 forward link], PSCH or
CPICH are missing or too low.
Verify that signal includes PSCH and CPICH and that
the signal level of each is adequate.
ü W-CDMA signal is frequency inverted. Press [
Instrument Mode], [demodulation setup] and
select [
freq spectrum mirror].
ü Frequency span is too narrow. See Frequency Span earlier in this chapter.
ü Analyzer’s center frequency is too far from
the signal center frequency.
See Center Frequency earlier in this chapter.
ü Too many active channels. Reduce the number of active channels in your
W-CDMA signal.
ü Incorrect scramble code specified. Press [
Instrument Mode], [demodulation setup],
[
scramble code] and set the scramble code to that used
by your signal.
ü Several base stations are transmitting and
the analyzer is using the Perch channel
from the wrong base station (the analyzer
selects the base station with the highest
Perch signal level).
Increase the Perch signal level for the station that you
want to lock to.
ü Code group selected and wrong group
number specified.
Press [
Instrument Mode], [demodulation setup],
[
scramble code] and enter the correct group number.
Wideband CDMA Concepts (Options B73, B79, and 080)
24 - 17
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